Improvement in propelling vessels



$.11. 111111111111. PBQPBLLING VBSSELS.

110. 104,512., PatentedJune 21, 1870.

SAMUEL D'. Tnmniin,-` 4or Jnnsnr ci'rY, Naw JERSEY."

Letters Para.: No. 104,512, daad Jamai, 1870.

IMPROVEMENT 1N PRPELLING vnssnns.

The Schedule referred to in these Letters Patent and makin'gvpart of the same To all whom it army concern` i Be it known that I, SAMUEL D. TILLMAN, of Jersey City, in' the county ofv Hudson and State of New Jersey, have invented certain new and useful' Improvements in Propelling Vessels; and I do hereby declare that the following is a full and exact .description thereof. My invention relates to the construction of the vessel at the rear, and the construction and arrange` ment of the propelling and steering means. I render available, as propelling-surface, the wholeA breadth of the immersed section. I use screw-propellers, la

ranged side by side. l

ManyV curious experiments have been made iu modifying the construction and arrangement of these parts, none Ofwhich have, as, yet, succeeded in accomplishing' the ends which I seek to attain.

I will first proceed to describe what I consider the best means ot' carrying out my invention, with some suggestions for modifications, and will afterward design-ate the point which I claim as new.

The accompanying drawing forms a part of this specification.

Figure 1 isa side elevation, showing the entire rear l portion of the vessel.

Figure f2 is a stem view, and

Figure 3 isa View of the same parts from below.

Similar lettersof reference indicate like parts in all the figures.

A1 is an over-hanging portion of the stern.

A2 A, 85e., are runsor extensions rearward from the main body of thehull, .which latter'is represented by A, and

Aa are extensions of the keel, adapted to support the lower end ofthe rudder.-

B B, &c., are balanced rudders, hung on vertical shafts b, provided with short levers Bl at their upper ends, which levers' are connected together bya rod, C, which is operated by hand, or lby machinery, to turn the rudders B all simultaneously, and to a uniform extent.

I employ four screw-propellers D D D D, iixed on. shafts d d, extending through suitable supports and stuing-hoxes in the rear of the runs A.v Ihese screws are, alternately, .right-handed and left-handed, and their shafts are correspondingly turned, in 'opposite directions, by one or more engines, not represented, working, in-any ordinary or suitable manner, in the interior of the vessel.

The runs A2 arev here represented as made with their after surfaces rounded, and their junction with the `main body A ofthe hull is inclined.

For vessels ot greater speed these runs-may be brought to a thin vertical edge, except at the part through which the propollershaft projects.

I do not limit `myself to these precise constructions. I work my improved propelling and steering .means quite eiilciently behind'a scow, having a body inclined upwardahont like the dotted line -in fig. 1, yet less abruptly, which represents the rear boundary ofthe main bodyor hull A, without the runs or extensions rearward, indicatcd by A?. I should, in such ease,

however, mount thepropellers nearer the main body A.

It is obvious that, by combining a series of bal.

anced rndders, the steering apparat-ns need notproject so far as when a single rudder isn used, and the parts can be made stronger iu proportion; besides, the failure of a single rudder would not disable the boat. f p

It will he observed that my arrangement provides an absolutely clear space quite across the stern of thc vessel, .which allows the several `screw-propellers to act eiiiciently on all `the water across the entire breadth of the stern. No part of the space is occupied by any stern-post, or other obstruction.

` The screws may have any number of plates desired,

and, by properly gearing or connecting the shafts within the vessel, so as to determine their positions with absolntecertainty, and mounting the screws sov that the blades of onemay correspond in position with the spaces in the next, I can allow` the areas swept by the several propellers to lap upon each oth er to al considerable extent. Such a proportioning would give a greater propelling surface,'whieh, for

slow vessels, would more than compensate for the in.

creased friction.

Iast vessels, on the contrary, might have the screws redneedin diameter, so that the extreme periphery described by one should not quite touch the ext-reine periphery described by the adjacent propellers.

.I do not claim mounting two or-l any other number of propellers oncach side of the stern-postv or deadwood.

My arrangement, it will bcv observed, extends the series of propellers, in acontinuous line, quite across the stern, without interruption by the interposition oi' a stern-post, or any other object.

I elaim-V i ."Ihc sci-ics of propellers D, arranged, as represented,

relatively to each-other and to the hull of the vessel, in the rear of a sepmate'propeller, D D, and sternthe propellers filling the entire space, and acting on post A A2,'as and for the purpose herein set forth the water lacross the wl1ole-breadth of the vessel, in and described. combination with any suitable steering means, and In testimony whereof I have hereunto set my name provision for allowing the access of the water to the in presence of two subscribing witnesses.

.propellers in the entire series, substantially as spcci- SAML. D. TILLMAN. fied. Witnesses:

Also, the series of balanced rudders B B, when op- W. C. DEY, exalted simultaneously, as shown, and arranged each H. E. PRICE. 

